/Engine/Source/Runtime/HeadMountedDisplay/Public/IHeadMountedDisplayModule.h
Extensions: If the HMD supports the various extensions listed below, it should return a valid pointer to an implementation contained within it.
virtual [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IHeadMountedDisplayVulkanExtensions](API\Runtime\HeadMountedDisplay\IHeadMountedDisplayVulkanExtensi-), ESPMode::ThreadSafe > GetVulkanExtensions()